package com.wanxin.wb.common.support;

import java.io.InputStream;
import java.io.Reader;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.builder.BaseBuilder;
import org.apache.ibatis.builder.BuilderException;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.builder.xml.XMLMapperEntityResolver;
import org.apache.ibatis.datasource.DataSourceFactory;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.loader.ProxyFactory;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.parsing.XNode;
import org.apache.ibatis.parsing.XPathParser;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.reflection.MetaClass;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
import org.apache.ibatis.session.AutoMappingBehavior;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.LocalCacheScope;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.type.JdbcType;

/**
 * 
 * <B>Description:</B> <br>
 * <B>Create on:</B> 2015年5月31日 上午9:55:08<br>
 *
 * @author 
 * @version 1.0
 */
public class CommodityXMLConfigBuilder extends BaseBuilder {
    private boolean     parsed;
    private XPathParser parser;
    private String      environment;

    public CommodityXMLConfigBuilder(Reader reader) {
        this(reader, null, null);
    }

    public CommodityXMLConfigBuilder(Reader reader, String environment) {
        this(reader, environment, null);
    }

    public CommodityXMLConfigBuilder(Reader reader, String environment, Properties props) {
        this(new XPathParser(reader, true, props, new XMLMapperEntityResolver()), environment,
            props);
    }

    public CommodityXMLConfigBuilder(InputStream inputStream) {
        this(inputStream, null, null);
    }

    public CommodityXMLConfigBuilder(InputStream inputStream, String environment) {
        this(inputStream, environment, null);
    }

    public CommodityXMLConfigBuilder(InputStream inputStream, String environment, Properties props) {
        this(new XPathParser(inputStream, true, props, new XMLMapperEntityResolver()), environment,
            props);
    }

    private CommodityXMLConfigBuilder(XPathParser parser, String environment, Properties props) {
        super(new CommodityConfiguration());
        ErrorContext.instance().resource("SQL Mapper Configuration");
        this.configuration.setVariables(props);
        this.parsed = false;
        this.environment = environment;
        this.parser = parser;
    }

    public Configuration parse() {
        if (parsed) {
            throw new BuilderException("Each XMLConfigBuilder can only be used once.");
        }
        parsed = true;
        parseConfiguration(parser.evalNode("/configuration"));
        return configuration;
    }

    private void parseConfiguration(XNode root) {
        try {
            propertiesElement(root.evalNode("properties")); //issue #117 read properties first
            typeAliasesElement(root.evalNode("typeAliases"));
            pluginElement(root.evalNode("plugins"));
            objectFactoryElement(root.evalNode("objectFactory"));
            objectWrapperFactoryElement(root.evalNode("objectWrapperFactory"));
            settingsElement(root.evalNode("settings"));
            environmentsElement(root.evalNode("environments")); // read it after objectFactory and objectWrapperFactory issue #631
            databaseIdProviderElement(root.evalNode("databaseIdProvider"));
            typeHandlerElement(root.evalNode("typeHandlers"));
            mapperElement(root.evalNode("mappers"));
        } catch (Exception e) {
            throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);
        }
    }

    private void typeAliasesElement(XNode parent) {
        if (parent != null) {
            for (XNode child : parent.getChildren()) {
                if ("package".equals(child.getName())) {
                    String typeAliasPackage = child.getStringAttribute("name");
                    configuration.getTypeAliasRegistry().registerAliases(typeAliasPackage);
                } else {
                    String alias = child.getStringAttribute("alias");
                    String type = child.getStringAttribute("type");
                    try {
                        Class<?> clazz = Resources.classForName(type);
                        if (alias == null) {
                            typeAliasRegistry.registerAlias(clazz);
                        } else {
                            typeAliasRegistry.registerAlias(alias, clazz);
                        }
                    } catch (ClassNotFoundException e) {
                        throw new BuilderException("Error registering typeAlias for '" + alias
                                                   + "'. Cause: " + e, e);
                    }
                }
            }
        }
    }

    private void pluginElement(XNode parent) throws Exception {
        if (parent != null) {
            for (XNode child : parent.getChildren()) {
                String interceptor = child.getStringAttribute("interceptor");
                Properties properties = child.getChildrenAsProperties();
                Interceptor interceptorInstance = (Interceptor) resolveClass(interceptor)
                    .newInstance();
                interceptorInstance.setProperties(properties);
                configuration.addInterceptor(interceptorInstance);
            }
        }
    }

    private void objectFactoryElement(XNode context) throws Exception {
        if (context != null) {
            String type = context.getStringAttribute("type");
            Properties properties = context.getChildrenAsProperties();
            ObjectFactory factory = (ObjectFactory) resolveClass(type).newInstance();
            factory.setProperties(properties);
            configuration.setObjectFactory(factory);
        }
    }

    private void objectWrapperFactoryElement(XNode context) throws Exception {
        if (context != null) {
            String type = context.getStringAttribute("type");
            ObjectWrapperFactory factory = (ObjectWrapperFactory) resolveClass(type).newInstance();
            configuration.setObjectWrapperFactory(factory);
        }
    }

    private void propertiesElement(XNode context) throws Exception {
        if (context != null) {
            Properties defaults = context.getChildrenAsProperties();
            String resource = context.getStringAttribute("resource");
            String url = context.getStringAttribute("url");
            if (resource != null && url != null) {
                throw new BuilderException(
                    "The properties element cannot specify both a URL and a resource based property file reference.  Please specify one or the other.");
            }
            if (resource != null) {
                defaults.putAll(Resources.getResourceAsProperties(resource));
            } else if (url != null) {
                defaults.putAll(Resources.getUrlAsProperties(url));
            }
            Properties vars = configuration.getVariables();
            if (vars != null) {
                defaults.putAll(vars);
            }
            parser.setVariables(defaults);
            configuration.setVariables(defaults);
        }
    }

    private void settingsElement(XNode context) throws Exception {
        if (context != null) {
            Properties props = context.getChildrenAsProperties();
            // Check that all settings are known to the configuration class
            MetaClass metaConfig = MetaClass.forClass(Configuration.class);
            
            for (Object key : props.keySet()) {
                if (!metaConfig.hasSetter(String.valueOf(key))) {
                    throw new BuilderException(
                        "The setting "
                                + key
                                + " is not known.  Make sure you spelled it correctly (case sensitive).");
                }
            }
            configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty(
                "autoMappingBehavior", "PARTIAL")));
            configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));
            configuration.setProxyFactory((ProxyFactory) createInstance(props
                .getProperty("proxyFactory")));
            configuration.setLazyLoadingEnabled(booleanValueOf(
                props.getProperty("lazyLoadingEnabled"), false));
            configuration.setAggressiveLazyLoading(booleanValueOf(
                props.getProperty("aggressiveLazyLoading"), true));
            configuration.setMultipleResultSetsEnabled(booleanValueOf(
                props.getProperty("multipleResultSetsEnabled"), true));
            configuration.setUseColumnLabel(booleanValueOf(props.getProperty("useColumnLabel"),
                true));
            configuration.setUseGeneratedKeys(booleanValueOf(props.getProperty("useGeneratedKeys"),
                false));
            configuration.setDefaultExecutorType(ExecutorType.valueOf(props.getProperty(
                "defaultExecutorType", "SIMPLE")));
            configuration.setDefaultStatementTimeout(integerValueOf(
                props.getProperty("defaultStatementTimeout"), null));
            configuration.setMapUnderscoreToCamelCase(booleanValueOf(
                props.getProperty("mapUnderscoreToCamelCase"), false));
            configuration.setSafeRowBoundsEnabled(booleanValueOf(
                props.getProperty("safeRowBoundsEnabled"), false));
            configuration.setLocalCacheScope(LocalCacheScope.valueOf(props.getProperty(
                "localCacheScope", "SESSION")));
            configuration.setJdbcTypeForNull(JdbcType.valueOf(props.getProperty("jdbcTypeForNull",
                "OTHER")));
            configuration.setLazyLoadTriggerMethods(stringSetValueOf(
                props.getProperty("lazyLoadTriggerMethods"), "equals,clone,hashCode,toString"));
            configuration.setSafeResultHandlerEnabled(booleanValueOf(
                props.getProperty("safeResultHandlerEnabled"), true));
            configuration.setDefaultScriptingLanguage(resolveClass(props
                .getProperty("defaultScriptingLanguage")));
            configuration.setCallSettersOnNulls(booleanValueOf(
                props.getProperty("callSettersOnNulls"), false));
            configuration.setLogPrefix(props.getProperty("logPrefix"));
            configuration.setLogImpl(resolveClass(props.getProperty("logImpl")));
            configuration.setConfigurationFactory(resolveClass(props
                .getProperty("configurationFactory")));
        }
    }

    private void environmentsElement(XNode context) throws Exception {
        if (context != null) {
            if (environment == null) {
                environment = context.getStringAttribute("default");
            }
            for (XNode child : context.getChildren()) {
                String id = child.getStringAttribute("id");
                if (isSpecifiedEnvironment(id)) {
                    TransactionFactory txFactory = transactionManagerElement(child
                        .evalNode("transactionManager"));
                    DataSourceFactory dsFactory = dataSourceElement(child.evalNode("dataSource"));
                    DataSource dataSource = dsFactory.getDataSource();
                    Environment.Builder environmentBuilder = new Environment.Builder(id)
                        .transactionFactory(txFactory).dataSource(dataSource);
                    configuration.setEnvironment(environmentBuilder.build());
                }
            }
        }
    }

    private void databaseIdProviderElement(XNode context) throws Exception {
        DatabaseIdProvider databaseIdProvider = null;
        if (context != null) {
            String type = context.getStringAttribute("type");
            if ("VENDOR".equals(type))
                type = "DB_VENDOR"; // awful patch to keep backward compatibility
            Properties properties = context.getChildrenAsProperties();
            databaseIdProvider = (DatabaseIdProvider) resolveClass(type).newInstance();
            databaseIdProvider.setProperties(properties);
        }
        Environment environment = configuration.getEnvironment();
        if (environment != null && databaseIdProvider != null) {
            String databaseId = databaseIdProvider.getDatabaseId(environment.getDataSource());
            configuration.setDatabaseId(databaseId);
        }
    }

    private TransactionFactory transactionManagerElement(XNode context) throws Exception {
        if (context != null) {
            String type = context.getStringAttribute("type");
            Properties props = context.getChildrenAsProperties();
            TransactionFactory factory = (TransactionFactory) resolveClass(type).newInstance();
            factory.setProperties(props);
            return factory;
        }
        throw new BuilderException("Environment declaration requires a TransactionFactory.");
    }

    private DataSourceFactory dataSourceElement(XNode context) throws Exception {
        if (context != null) {
            String type = context.getStringAttribute("type");
            Properties props = context.getChildrenAsProperties();
            DataSourceFactory factory = (DataSourceFactory) resolveClass(type).newInstance();
            factory.setProperties(props);
            return factory;
        }
        throw new BuilderException("Environment declaration requires a DataSourceFactory.");
    }

    private void typeHandlerElement(XNode parent) throws Exception {
        if (parent != null) {
            for (XNode child : parent.getChildren()) {
                if ("package".equals(child.getName())) {
                    String typeHandlerPackage = child.getStringAttribute("name");
                    typeHandlerRegistry.register(typeHandlerPackage);
                } else {
                    String javaTypeName = child.getStringAttribute("javaType");
                    String jdbcTypeName = child.getStringAttribute("jdbcType");
                    String handlerTypeName = child.getStringAttribute("handler");
                    Class<?> javaTypeClass = resolveClass(javaTypeName);
                    JdbcType jdbcType = resolveJdbcType(jdbcTypeName);
                    Class<?> typeHandlerClass = resolveClass(handlerTypeName);
                    if (javaTypeClass != null) {
                        if (jdbcType == null) {
                            typeHandlerRegistry.register(javaTypeClass, typeHandlerClass);
                        } else {
                            typeHandlerRegistry.register(javaTypeClass, jdbcType, typeHandlerClass);
                        }
                    } else {
                        typeHandlerRegistry.register(typeHandlerClass);
                    }
                }
            }
        }
    }

    private void mapperElement(XNode parent) throws Exception {
        if (parent != null) {
            for (XNode child : parent.getChildren()) {
                if ("package".equals(child.getName())) {
                    String mapperPackage = child.getStringAttribute("name");
                    configuration.addMappers(mapperPackage);
                } else {
                    String resource = child.getStringAttribute("resource");
                    String url = child.getStringAttribute("url");
                    String mapperClass = child.getStringAttribute("class");
                    if (resource != null && url == null && mapperClass == null) {
                        ErrorContext.instance().resource(resource);
                        InputStream inputStream = Resources.getResourceAsStream(resource);
                        XMLMapperBuilder mapperParser = new XMLMapperBuilder(inputStream,
                            configuration, resource, configuration.getSqlFragments());
                        mapperParser.parse();
                    } else if (resource == null && url != null && mapperClass == null) {
                        ErrorContext.instance().resource(url);
                        InputStream inputStream = Resources.getUrlAsStream(url);
                        XMLMapperBuilder mapperParser = new XMLMapperBuilder(inputStream,
                            configuration, url, configuration.getSqlFragments());
                        mapperParser.parse();
                    } else if (resource == null && url == null && mapperClass != null) {
                        Class<?> mapperInterface = Resources.classForName(mapperClass);
                        configuration.addMapper(mapperInterface);
                    } else {
                        throw new BuilderException(
                            "A mapper element may only specify a url, resource or class, but not more than one.");
                    }
                }
            }
        }
    }

    private boolean isSpecifiedEnvironment(String id) {
        if (environment == null) {
            throw new BuilderException("No environment specified.");
        } else if (id == null) {
            throw new BuilderException("Environment requires an id attribute.");
        } else if (environment.equals(id)) {
            return true;
        }
        return false;
    }

}
